cannot load such file -- rack/showexceptions (LoadError)

[sashazykov]

It raises exception on requiring the gem.

/usr/local/bundle/gems/sinatra-1.0/lib/sinatra/showexceptions.rb:1:in `require': cannot load such file -- rack/showexceptions (LoadError)
	from /usr/local/bundle/gems/sinatra-1.0/lib/sinatra/showexceptions.rb:1:in `<top (required)>'
	from /usr/local/bundle/gems/sinatra-1.0/lib/sinatra/base.rb:6:in `require'
	from /usr/local/bundle/gems/sinatra-1.0/lib/sinatra/base.rb:6:in `<top (required)>'
	from /usr/local/bundle/gems/fake_braintree-0.8.0/lib/fake_braintree/sinatra_app.rb:1:in `require'
	from /usr/local/bundle/gems/fake_braintree-0.8.0/lib/fake_braintree/sinatra_app.rb:1:in `<top (required)>'
	from /usr/local/bundle/gems/fake_braintree-0.8.0/lib/fake_braintree/server.rb:3:in `require'
	from /usr/local/bundle/gems/fake_braintree-0.8.0/lib/fake_braintree/server.rb:3:in `<top (required)>'
	from /usr/local/bundle/gems/fake_braintree-0.8.0/lib/fake_braintree.rb:8:in `require'
	from /usr/local/bundle/gems/fake_braintree-0.8.0/lib/fake_braintree.rb:8:in `<top (required)>'

[dsheard]

Same issue!

[mrjonesbot]

Solution:
Resolve Sinatra to '~> 2.0.0.beta2' in the .gemspec.
For reference: sinatra/sinatra#1055
The issue was with an out of date rack version, Sinatra 2.0.0.beta2 provides support for rack 2.0.

Fix is available on forked master branch: https://github.com/mrjonesbot/fake_braintree